org.apache.asterix.metadata.dataset.hints

Class DatasetHints.DatasetCardinalityHint

java.lang.Object

org.apache.asterix.metadata.dataset.hints.DatasetHints.DatasetCardinalityHint

All Implemented Interfaces:

IHint

Enclosing class:

DatasetHints

public static class DatasetHints.DatasetCardinalityHint
extends Object
implements IHint

Hint representing the expected number of tuples in the dataset.

Field Summary

Fields

Modifier and Type	Field and Description
static long	DEFAULT
static String	NAME

Constructor Summary

Constructors

Constructor and Description
DatasetHints.DatasetCardinalityHint()

Method Summary

Methods

Modifier and Type	Method and Description
String	getName() retrieve the name of the hint.
org.apache.hyracks.algebricks.common.utils.Pair<Boolean,String>	validateValue(String value) validate the value associated with the hint.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

NAME

public static final String NAME

See Also:

Constant Field Values

DEFAULT

public static final long DEFAULT

See Also:

Constant Field Values

Constructor Detail

DatasetHints.DatasetCardinalityHint

public DatasetHints.DatasetCardinalityHint()

Method Detail

getName

public String getName()

Description copied from interface: IHint

retrieve the name of the hint.

Specified by:

getName in interface IHint

Returns:

validateValue

public org.apache.hyracks.algebricks.common.utils.Pair<Boolean,String> validateValue(String value)

Description copied from interface: IHint

validate the value associated with the hint.

Specified by:

validateValue in interface IHint

Parameters:

value - the value associated with the hint.

Returns:

a Pair with first element as a boolean that represents the validation result. second element as the error message if the validation result is false